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June 3, 2026Zhongguo kexue. Wulixue Lixue Tianwenxue0 citations

Analysis of bubble pulsation characteristics of underwater explosion with large buoyancy parameters near boundary conditions

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HLHao LiangSWShiping WangYLYunlong Liu

Key Points

  • This research aims to analyze how bubble pulsation characteristics vary during underwater explosions influenced by buoyancy parameters and boundary conditions.
  • Developed EFEM numerical model for underwater explosion bubbles considering various bottom boundaries.
  • Conducted oversized gravity field tests for 2500 kg TNT equivalent load in shallow water.
  • Studied the impact of mud and rigid bottom boundaries on bubble pulsation and free surface coupling.
  • Bubbles closer to the bottom exhibit longer first cycle pulsation time and greater pulsation pressure.
  • The maximum growth rate of the main peak occurs at bottom distance γ<sub>bb</sub> = 0.5, with increasing skirt width.
  • Rigid boundary bubbles show peak pulsation pressure and growth rate higher than mud boundary under equal distance parameters.

Abstract

水下爆炸发生在浅水中,其生成的气泡会同时受到自由面和海底泥沙的作用,呈现非球形运动、皇冠型水冢等显著的非线性效应。这种非线性效应随着爆炸当量的提高而增强,受到浮力参数、距离参数等的共同限制。为此,本文建立计及不同底部边界的水下爆炸气泡脉动EFEM数值模型,并开展了超重力场大缩比近自由面水下爆炸试验,主要开展了2500kgTNT等效载荷在浅水爆炸时气泡脉动特性及自由面耦合演化研究,验证了超重力模型试验相似的准确性,得到了不同距离下泥质和刚性两种底部边界对气泡脉动和自由面耦合影响的规律。发现气泡初始中心位置到底部距离γbb越小,气泡第一周期脉动时间越长,气泡脉动压力越大,围裙高度增长速率越低;γbb越大,水冢主峰高度增速先增后降,在γbb = 0.5时增速最大,围裙宽度也越大。在距离参数相同时,刚性边界气泡脉动压力峰值、水冢主峰高度及其变化速度、围裙高度及其变化速度均大于泥质边界。

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Cite This Study

Liang et al. (2026) studied this question.

synapsesocial.com/papers/6a1fc40fdee9eb8c0dce59c9https://doi.org/10.1360/sspma-2026-0296
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